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My MacBook air will display a weird static pattern upon being woken from sleep, most often when I switch from one network location to another (although it also happens when I awaken it at the same place.)

Rebooting the machine makes the problem go away.

Example screenshot:

enter image description here

Any ideas on what could be causing it?

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It's just the area of one window on the screen, right? – Daniel Beck Jan 16 '13 at 12:37
Sorry; additional clarification -- in the attached screenshot it is clearly in one app window area -- however, it also occurs in the top of the screen (in the Apple menu bar) and other places. – Dave Rodger Jan 17 '13 at 0:15
But it's always one "item" being displayed, right? Be it Dock (rectangular outline), menu bar, a window, or maybe an icon. It's never like in the other questions linked by techie007? – Daniel Beck Jan 17 '13 at 9:02
Ah; yes -- it definitely appears to be bounded by a window region or box -- i.e. feels like software not hardware from that perspective. Although sometimes it is the whole screen -- when I have screen saver on and wake it up, e.g., or when doing a restart, the whole screen goes like that. – Dave Rodger Jan 19 '13 at 15:09
I have exactly the same issue. However, I don't have to reboot in order for the symptoms to go away. I only need to close the screen for about 10 seconds. When I reopen, things are back to normal, but it's still a bit annoying. – user219034 Apr 23 '13 at 1:29

Looks like bad video drivers, or failing video RAM, or video adapter, additionally it could be a loose connection inside the notebook (i.e.: from the motherboard or video adapter to the LCD panel itself).

If you're not comfortable opening it and attempting repairs yourself, then I think it's time to take it in for hardware checks and possible replacement.

A couple similar questions to perhaps check out:

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That was my initial reaction, also, but the problem is not the whole screen, just the contents of a window. – fixer1234 Feb 14 '15 at 19:39

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